KR101868649B1 - Impact-absorbing pad, clothing furnished with same and method for preventing femoral fractures - Google Patents

Abstract

(Problem) A shock absorptive force for preventing the fracture of the femur neck which is required for an impact-absorbing pad used for a hip protector, a mounting feeling that does not discomfort the use for the whole day, a thinness which does not obstruct the appearance, An elasticity in the direction of the plane not giving, an impact absorbing pad satisfying all of the above, a garment attached thereto, and a method for preventing femur fracture.
A shock absorbing skin (12) having a maximum length of 80 mm or less and an area of 600 mm 2 to 5000 mm 2 is formed in the pad body (11) having an impact absorbing function , And prevents the fracture of the femur by disposing the pad main body (11) so that the impact skin (12) corresponds to the femur electrify portion (1).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an impact absorbing pad, a garment having the same, and a method for preventing a femur fracture.

INDUSTRIAL APPLICABILITY The present invention can be applied to clothes, particularly to an appropriate site in the vicinity of the waist of an undergarment, to provide a shock that can be used for the purpose of preventing fracture at the time of turning, particularly, osteoporosis, Absorbers and garments to which they are attached, especially garments such as pants, and methods of preventing femoral fractures.

Fracture due to conduction, particularly femoral neck fracture, is known as a factor that causes elderly people to live with the disease (Non-Patent Document 1). Elderly people, particularly elderly women, are at increased risk of fracture by conduction due to mild stabbing to such an extent that the bones are weakened by osteoporosis. In the investigation of the incidence of femoral neck fracture (non-patent document 2), the number of femoral neck fractures in one year increased from 53,200 in 1987 to 148,100 in 2007, reflecting the aging of the population. It is of great significance to prevent not only treatment but also its occurrence from the point of view of increase and QOL of elderly person. As an intervention method with evidence of femoral neck fracture prevention, there are the administration of an agent to increase bone density and the use of a hip protector as a protective tool (Non-Patent Document 3). Since the hip protector applies elderly people with high risk of conduction so that they do not know when to evacuate, they need to be used all day.

For example, a hip protector having a dome-shaped member (Patent Document 1) is made of a hard resin such as polypropylene foam. The hard pad is of the external force diffusion type and has an excellent impact absorbing performance by increasing the area to which the external force is applied and attenuating the external force due to the elasticity of the material. However, a hip protector using a hard pad has a poor feeling of wearing, for example, consciously or unconsciously removing it at the time of bedtime, and there is a risk of fracture due to conduction therebetween. On the other hand, a soft pad made of an acrylic polymer (Patent Document 2) has been proposed in order to improve mounting feeling. Such soft pads are of the external force absorbing type, and the external force is thermally converted by the deformation of the material to attenuate the external force. The bottom protector using a soft pad has improved mounting feeling as compared with a hard pad, but the pad is thick because of low shock absorption performance. Even if the wearer wears the clothes with these soft pads, the shape of the pads can be known from the outer appearance, and it is difficult for older women who care about the appearance to accept them. In addition, the air permeability is not sufficient.

Generally, the bottom protector is an underwear type such as pants because of necessity of wearing all day. It is often difficult to attach and detach a pad which is poor in flexibility in the direction of the face even when it is put on and taking off when changing clothes in a bathroom, hard pad or soft. In nursing care facilities, nursing aids may help detachment from the bathroom, but at that time, it is not good to evaluate the fact that the hip protectors so far are difficult to remove.

The pad used for the hip protector is required to have a shock absorbing ability for preventing femoral neck fracture, a mounting feeling that does not cause an uncomfortable feeling all day, a breathability, a thinness that does not hinder the appearance, and a flexibility in the surface direction The fact that it meets all conditions is not found at present.

Japanese Published Patent Publication No. 9-508824 Japanese Patent Application Laid-Open No. 9-268409

 Lauritzen JB, Hayashi Yasufumi, Orimo Hajime: prevention of conduction and fracture by a hip protector. Osteoporosis Japan, 10: 149-157, 2002.  Fifth Femoral Neck Fracture National Frequency Study  Atsushi Harada: Exercise instability and future development, Orthopedic and Disaster Surgery 50: 27-35, 2007

A shock absorptive force for preventing the fracture of the femur neck which is required for the impact absorbing pad used for the hip protector, a mounting feeling that does not cause an uncomfortable feeling during all-day use, ventilation, a thinness that does not hinder the appearance, Directional flexibility, an impact absorbing pad satisfying all of the above, clothing equipped with the same, and a method of preventing a femur fracture.

The impact absorbing pad according to the present invention is characterized in that a shock absorbing skin composed of a through hole or recess having a maximum length of 80 mm or less and an area of 600 mm 2 to 5000 mm 2 is formed on the pad body having an impact absorbing function, And the impact preventing portion prevents the fracture of the femur by disposing the pad body so as to correspond to the femur supporter.

In this impact absorbing pad, the impact absorbing pad is mounted on the side of the body on the side of the femoral head electromagnet so that the impact preventing portion of the impact absorbing pad faces the femoral electromagnet, so that the impact force against the femoral electromagnet during conduction, It is possible to effectively prevent the fracture of the femur neck portion by acting on the main body and peripheral portions of the femoral fixation portion facing the main body and preventing the impact force from directly acting on the femur trochanter by the impact skin. When the impacted skin exceeds 80 mm, the femoral cord auger part protrudes outward from the pad body, and the impact force at the time of conduction directly acts on the femoral cord auger part, so that it is set to 80 mm or less. In addition, the area of the impactor skin is set to 600 mm 2 or more and 5000 mm 2 or less so that the pad body is disposed around the femoral head electromagnet. The impact-resistant skin is preferably composed of a through-hole, but it may be composed of a concave portion. In the case of the recessed portion, the shock absorbing pad is mounted with its opening side directed toward the femoral head electrified portion side. The inner side of the impact-resistant skin is preferably made of a hollow for improving the weight-saving and air permeability. It is also a category of the present invention that the member which is softer than the pad body is filled in the impact-resistant skin. It is also possible to constitute a shock-absorbing skin by arranging a plurality of thin and long slit-shaped through holes or recesses so that the total area is 600 mm 2 to 5000 mm 2. In addition, the inner circumferential surface of the impactor skin may be constituted by a tapered surface whose diameter is expanded toward the mounting surface side with respect to the body, so that the impact force may be continuously or stepwise reduced as it goes toward the femoral surchargeor portion.

Here, it is preferable that the thickness of the pad body is set to 13 mm or less. When the thickness of the pad body exceeds 13 mm, the line of the impact absorbing pad is exposed on the surface of the garment to deteriorate the appearance of the garment, and the flexibility in the surface direction of the impact absorbing pad deteriorates, , And 13 mm or less.

It is preferable to set the distance from the upper end of the impact skin to the upper end of the pad body to 10 mm or more. When the distance is less than 10 mm, the shock absorbing action by the pad body and the impact force of the impact force by the pad body become small, and the shock absorbing force can not be sufficiently secured. In this specification, the head side portion of the human body when the impact absorbing pad is applied to the human body is defined as the upper side, and the leg side is defined as the lower side, and the following description will be given.

At least one first relieved portion including a through hole or a concave portion having an upper end at a position of 5 mm to 50 mm from the lower end of the impulsive skin is formed below the impulsive skin of the pad body, It is also a preferred embodiment to set the length of the maximum portion of the first relieving portion to 5 mm or more and 50 mm or less. In this case, the first abatement portion prevents a large impact force from acting on the upper portion of the femoral shaft alveolus, thereby more effectively preventing the fracture of the femoral neck. In addition, the first abatement portion can improve air permeability and reduce wetness, and can make the impact absorbing pad light in weight. In addition, the flexibility of the pad body can be increased, and the discomfort during attachment and detachment can be reduced have.

It is preferable that the first relief portions are formed vertically in parallel with each other. With this configuration, since the one impacting skin and the two first abrasion parts are arranged vertically in the vertical direction, the flexibility of the pad body around the vertical line passing through the impacting skin and the first abatement part can be improved, It is possible to more effectively alleviate the uncomfortable feeling.

It is also a preferred embodiment to form the second relieved portion composed of at least one through hole or concave portion at 50% or less of the total area of the impacted skin and the entire area other than the first relieved portion in the pad body. In this case, the second relieving portion can further improve the breathability to reduce the wetness, and the impact absorbing pad can be made lightweight, and the flexibility of the pad body can be enhanced to further alleviate discomfort at the time of attaching and detaching .

It is preferable that the pad body is composed of an elastomer as an isobutylene block copolymer composed of a polymer block having isobutylene as a constituent monomer and a polymer block having an aromatic vinyl monomer as a constituent monomer. In this case, the pad body made of such a material is preferable from the standpoint of excellent impact absorbability at a wide temperature range.

It is a preferred embodiment that the elastomer contains a tackifier resin. In this case, the tackifier resin is preferable because the impact absorbability of the elastomer in the vicinity of body temperature can be increased.

It is a preferred embodiment that the pad body is made of an elastomer foam. In this case, the impact absorbing property of the pad body can be easily improved.

In the garment related to the present invention, the impact absorbing pad is mounted on the garment main body such that the impact absorbing portion of the impact absorbing pad is disposed corresponding to the femur supporter.

In this garment, since the impact absorbing pad is mounted on the garment main body such that the impact absorbing pad of the impact absorbing pad is disposed corresponding to the femur electrify portion, the impact force on the femoral head electromagnet portion Is acted on and absorbed by the periphery of the pad main body and the femoral electrify portion facing the pad body so that the impact force does not directly act on the femoral head electromagnet due to the impact skin, thereby effectively preventing the fracture of the femoral neck.

Here, it is preferable that the shock absorbing pad is mounted so as to be freely detachably attached to the garment main body. In this case, since the impact absorbing pad can be detached from the garment main body and the garment main body can be washed, it is possible to share the expensive shock absorbing pad with a plurality of clothes, thereby reducing the economic burden on the user.

Preferably, the garment body is a pant. Since the pants are arranged so as to cover the femoralike charging part, it is preferable to mount the present shock-absorbing pad.

In the method of preventing femur fracture according to the present invention, the impact-absorbing pad of the impact-absorbing pad mounts the impact-absorbing pad so as to correspond to the femoral-body electromagnet.

In the method for preventing femur fracture, the impact absorbing pad of the impact absorbing pad is mounted so that the impact absorbing pad corresponds to the femur supporter. Therefore, as in the case of the impact absorbing pad, And the peripheral portion of the femoral fixer portion facing the femur, so that the impact force is not directly applied to the femur trochanter by the impact skin, whereby the fracture of the femur neck can be effectively prevented.

According to the shock absorbing pad, the garment having the same, and the method for preventing the femur fracture according to the present invention, the shock absorbing pad is disposed on the impact absorbing pad so as to include the area corresponding to the femur supporter, The femoral neck fracture caused by elderly person's conduction can be prevented. In addition, by providing the first relieved portion at the lower portion of the shock absorbing skin to ensure air permeability, and by forming the second relieved portion at the right and left of the first relieving portion, flexibility in the longitudinal direction of the pad is ensured, Can be eliminated.

1 is a front view of an impact absorbing pad.
Fig. 2 (a) is a front view, and Fig. 2 (b) is a side view of a garment to which an impact absorbing pad is attached.
3 (a) to 3 (d) are front views of the impact absorbing pad of the embodiment.
4 (a) to 4 (d) are front views of a shock absorbing pad of a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, upper, lower, left, and right are defined with reference to Fig. 1.

As shown in Figs. 1 and 2, the impact absorbing pad 10 has a pad body 11 having an impact absorbing action, a through hole having a maximum length of 80 mm or less, an area of 600 mm 2 to 5000 mm 2 And the impact absorbing pad 10 is disposed on both sides of the body so that the impact skin 12 corresponds to the femur electrify portion 1, It is to prevent fractures.

In the case where the shock absorptive skin 12 composed of the through hole or the concave portion is not formed in correspondence with the femur electrify portion 1, the impact force by the conductive body is not applied to the pad body 11 11 to the femoral neck 2 and there is a risk of fracture. On the other hand, if the thickness of the pad main body 11 is made sufficiently thick so that the impact force is not transmitted to the femoral neck portion 2, the mounting feeling and appearance are damaged. Therefore, in the present invention, by forming the impact skin 12 in the region corresponding to the femur electrify portion 1, it is possible to prevent the impact force from being diffused to the surrounding soft tissues and directly affecting the femur electrify portion 1 , And a thin shock absorbing pad (10) which does not hinder mounting feeling and appearance.

When the length of the maximum portion of the impact skin 12 exceeds 80 mm, the top of the femur electrify portion 1 protrudes outward from the pad body 11, ), It is set to 80 mm or less. It is preferable that the area of the impact skin 12 is 600 mm 2 to 5000 mm 2 so as to surround the femur electrify portion 1 and the pad body 11 is disposed. More preferably, the maximum length is 60 mm or less and the area is 700 mm 2 to 4000 mm 2. More preferably, the maximum length is 60 mm or less, and the area is 700 mm 2 or more and 2000 mm 2 or less.

The impact skin 12 may be formed as a through hole or a non-through recess, but it is preferable that it is formed of a through hole from the viewpoint of air permeability. When the impact skin 12 is formed as a concave portion, the impact absorbing pad 10 is disposed with the opening directed toward the femur electrify portion 1 side. It is also possible to constitute a groove-shaped concave portion which is elongated in the longitudinal direction or the transverse direction.

The shape of the impact skin 12 is not particularly limited, but may be circular, elliptical, triangular, rectangular, polygonal, gourd, cruciform, arch, moon, round, A round polygonal shape, and the like. Preferably circular, elliptical, and more preferably circular. It is preferable that the inner circumferential surface of the impact skin 12 is formed in a cylindrical shape. However, the inner circumferential surface of the impact skin 12 may be formed of a tapered surface whose diameter is expanded toward the mounting surface side with respect to the body, Or may be configured to be smaller in steps.

When the pad main body 11 is arranged so that the impact skin 12 corresponds to the femur electrify portion 1 as shown in Fig. 2, the skin of the impact skin 12 faces the femur electrify portion 1, 11) on the body surface. The impact skin 12 may be arranged so as to partially include the area of the body surface facing the femur electrify portion 1. The impact force is not applied to the femur electrify portion 1 via the pad body 11 , It is preferable to arrange so as to include the entire surface area of the body facing the femoraltarian electrify part 1 in a whole area.

The shape of the pad body 11 is not particularly limited, but may be circular, elliptical, polygonal such as rectangular or rhombic, and arbitrary irregularities formed on the surface. In addition, a through-hole may be appropriately formed in order to provide air permeability. Preferably rectangular, elliptical. Among them, an elliptical shape is preferable from the viewpoint of wearability.

If the thickness of the pad body 11 is excessively large, the line of the pad body 11 is exposed on the surface of the clothes and the flexibility of the surface direction of the pad body 11 is deteriorated, It is preferable to set it to 13 mm or less, more preferably to 10 mm or less, and furthermore preferably to 8 mm or less from the viewpoint of eliminating discomfort and appearance discomfort. Here, the thickness of the pad main body 11 means the thickness of the maximum part of the pad main body 11. [ The pad body 11 may be a flat plate having a uniform thickness, a thick central portion and a thin end portion, or may have a thickness different from place to place. It is also preferable that a chamfered surface is formed at an edge portion of the outer peripheral edge of at least the outer surface side of the pad body 11. In other words, when the pad body 11 is used by being put on clothes such as pants, the portion of the pad body 11 that abuts the edge portion of the outer peripheral edge of the pad body 11 becomes thinner and thinner, It is preferable to form chamfering surfaces at the corners of the outer peripheral edge of at least the outer surface side of the pad body 11 in order to prevent this. The chamfer surface may be an inclined surface or a circular arc surface. The chamfered surface is preferably formed to extend over the entire circumference of the outer peripheral edge of the pad body 11, but may be partially formed. The chamfering surface of the pad main body 11 can be formed in any desired range and can be formed to the entire thickness of the outer circumferential thickness of the pad main body 11, The chamfered surface can be formed in a range of about 1/2 or less of the outer circumferential thickness of the pad body 11. In addition to the outer peripheral edge of the pad body 11, a chamfered surface may be formed on the edge portion of the opening edge of at least the outer surface side of the impact skin 12 in the same manner as described above.

The distance from the upper end of the impactor skin 12 to the upper end of the pad body 11 is preferably set to 10 mm or more, more preferably 20 mm or more, more preferably 35 mm or more .

It is preferable to form at least one first relieved portion 13 composed of a through hole or a concave portion below the impact skin 12. The distance between the lower end of the impact skin 12 and the upper end of the first abatement portion 13 is 5 mm or more and 50 mm or less, preferably 10 mm or more and 40 mm or less, and most preferably, It is set to 10 mm or more and 30 mm or less from the lower end of the impact skin 12 in view of reducing the impact force. By forming the first relief portion 13 in addition to the impact skin 12, the flexibility in the surface direction of the pad body 11 is improved, the feeling of discomfort during attachment and detachment is reduced, and the breathability is improved, . Further, by forming the first relief portion 13, the impact force transmitted to the femoral neck portion 2 can be reduced by changing the path through which the impact force is transmitted during the conduction.

The first relieved portion 13 can be formed as a through hole or a non-through concave portion, and it is preferable that the first relieving portion 13 is formed as a through hole from the viewpoint of air permeability. When the first relieving portion 13 is formed as a concave portion, the impact absorbing pad 10 is disposed with the opening directed toward the femoral-body electrify portion 1 side. The diameter of the first relief portion 13 is preferably set to 5 mm or more and 50 mm or less, more preferably 5 mm or more and 40 mm or less in diameter, and most preferably, 5 mm or more and 30 mm or less.

The shape of the first relieving portion 13 is not particularly limited as long as it is the shape of the impact skin 12, but may be circular, elliptical, , A rectangular shape with rounded corners, and a polygonal shape with rounded corners. More preferably a circular shape, an elliptical shape, and a rectangular shape. More preferably a circular shape or a rectangular shape. At least one first relieving portion 13 may be provided, and eight or more first relieving portions 13 may be provided.

As shown in Fig. 1, it is preferable that the first relief portions 13 are arranged vertically below the impact skin 12. Although the position and the number of the arrangement of the first relieving portion 13 are not particularly limited, it is preferable to arrange the first relieving portion 13 in a circular shape having a diameter of 20 mm and having an upper end at a position of 20 mm from the lower end of the impact- It is preferable to form the first relieving portion 13 having a diameter of 20 mm and having an upper end at a position of 10 mm from the lower end of the first relieving portion 13. [

At least one second relieved portion 14 can be formed in 50% or less of the total area of the pad body 11 other than the impact repulsive skin 12 and the first relieved portion 13. [ The second relieved portion 14 may be formed as a through hole or a non-through recess, and it is preferable that the second relieved portion 14 is formed as a through hole from the viewpoint of air permeability. The position and the number of arrangement of the second relieving portion 14 are not particularly limited. For example, it is preferable to form at least one second relieving portion 14 in the left-right direction of the first relieving portion 13 Do. From the viewpoint of ensuring air permeability and flexibility in the plane direction, more preferably, two in total can be formed, one on each side, as shown in Fig. In order to improve air permeability, small holes may be formed at a position other than the impact reducing skin 12 and the first relieving portion 13 within a range not lowering the impact absorbing property to 50% or less of the total area.

The material constituting the pad body 11 is preferably measured in accordance with JIS K 7171 from the viewpoint of mounting feeling, and the calculated bending elastic modulus is preferably 100 MPa or less. More preferably 50 MPa or less. More preferably 20 MPa or less from the viewpoint of reducing the resistance at the time of attaching and detaching.

The elastomer constituting the pad body is preferably an isobutylene block copolymer comprising a polymer block having an aromatic vinyl compound as a constituent monomer and a polymer block having an aliphatic hydrocarbon compound as a constituent monomer.

Examples of the structure of the polymer block include a polymer block having an aromatic vinyl compound as a constituent monomer, a polymer block having an aliphatic hydrocarbon compound as a constituent monomer, a triblock copolymer comprising a polymer block having an aromatic vinyl compound as a constituent monomer, A diblock copolymer comprising a polymer block having an aromatic vinyl compound as a constituent monomer and a polymer block having a constitutional monomer as a constituent monomer, a polymer block comprising an aromatic vinyl compound as a constituent monomer and an aliphatic hydrocarbon compound as constituent monomers (Star) block copolymer having three or more arms made of a polymer block which is a block copolymer (block copolymer). They may be used alone or in combination of two or more in order to obtain desired physical properties and molding processability.

The weight ratio of the polymer block having an aromatic vinyl compound as a constituent monomer to the polymer block having an aliphatic hydrocarbon compound as a constituent monomer is not particularly limited, but from the viewpoints of the impact absorbability of the foam, the moldability, and the shape- (Polymer block having an aliphatic hydrocarbon compound as a constituent monomer) / (polymer block having an aromatic vinyl compound as a constituent monomer) = 95/5 to 60/40 (weight ratio), more preferably 90/10 to 65/35 (Weight ratio) is preferable.

Examples of the aromatic vinyl compound include, but are not limited to, styrene, o-, m- or p-methylstyrene,? -Methylstyrene,? -Methylstyrene, 2,6- Methylstyrene,? -Methyl-o-methylstyrene,? -Methyl-o-methylstyrene,? -Methyl-p-methylstyrene, Methyl-2,6-dimethylstyrene,? -Methyl-2,6-dimethylstyrene,? -Methyl-2,6-dimethylstyrene, -Methyl-2,4-dimethylstyrene, o-, m- or p-chlorostyrene, 2,6-dichlorostyrene, 2,4-dichlorostyrene, -chloro-o-chlorostyrene, Chlorostyrene,? -Chloro-p-chlorostyrene,? -Chloro-o-chlorostyrene,? -Chloro-m-chlorostyrene,? -Chloro-p-chlorostyrene, 2,4,6-trichlorostyrene,? -Chloro-2,6-dichlorostyrene, -chloro-2,4-dichlorostyrene, -chloro-2,6-dichloro O-, m- or p-butylstyrene, o-, m- or p-methoxystyrene, o-, m- or p-chloromethylstyrene, o -, m- or p-bromomethylstyrene, a styrene derivative substituted with a silyl group, indene, and vinylnaphthalene. These may be used alone or in combination of two or more. Among them, at least one member selected from the group consisting of styrene, p-methylstyrene,? -Methylstyrene and indene is preferable from the viewpoints of easiness of availability and balance of physical properties. By polymerizing these aromatic vinyl compounds as a main component, a polymer block comprising an aromatic vinyl compound as a constituent monomer is formed.

The polymer block comprising the aliphatic hydrocarbon-based compound as a constituent monomer is preferably a polymer block composed mainly of a conjugated diene. The conjugated diene is not particularly limited, and examples thereof include 1,3-butadiene, isoprene, chloroprene , 2,3-dimethyl-1,3-butadiene, and the like. These may be used alone or in combination of two or more. Among them, at least one kind selected from the group consisting of 1,3-butadiene and isoprene is preferable from the viewpoint of availability and balance of physical properties. In the polymer block containing a conjugated diene as a main component, hydrogenation may be carried out if necessary, or a vinyl compound other than a conjugated diene may be copolymerized.

A polymer block containing conjugated diene as a main component, a block obtained by polymerizing the conjugated diene so as to contain a large amount of 3,4 or 1,2 bonds, a water-containing block of the conjugated diene polymer, or a polymer block containing isobutylene as a main component Is preferable in that the impact absorbing property at room temperature is excellent. Among them, the polymer block containing a conjugated diene as a main component containing a large amount of the bonds tends to have a low impact absorbing property at a temperature outside the specific temperature range. Specifically, it is particularly preferable that a polymer block containing isobutylene as a main component is excellent in impact absorbability at a wide temperature range.

Further, in the polymer block containing isobutylene as a main component, other vinyl compound may be copolymerized if necessary.

When the polymer block comprising an aliphatic hydrocarbon-based compound as a constituent monomer is a polymer block composed mainly of isobutylene, the method for producing the elastomer is not particularly limited. For example, the presence of a compound represented by the following general formula (1) , An elastomer is obtained by polymerizing a monomer component containing isobutylene as a main component and a monomer component containing an aromatic vinyl monomer as a main component.

(CR ¹ R ² X) _n R ³ (1)

Wherein X represents a halogen atom, an alkoxy group having 1 to 6 carbon atoms or an acyloxy group having 1 to 6 carbon atoms. R ¹ and R ² each represent a hydrogen atom or a monovalent hydrocarbon group of 1 to 6 carbon atoms, and R ¹ and R ² may be the same or different. R ³ is a polyvalent aromatic hydrocarbon group or polyvalent aliphatic hydrocarbon group, and n represents a natural number of 1 to 6]

It is considered that the compound represented by the above general formula (1) serves as an initiator and generates carbon cations in the presence of a Lewis acid or the like to be a starting point of cationic polymerization. Examples of the compound of the general formula (1) used in the present invention include the following compounds.

(1-chloro-1-methylethyl) benzene, 1,4-bis (1-chloro- Tris (1-chloro-1-methylethyl) benzene, and 1,3-bis (1-chlor-1-methylethyl) -5- (tert-butyl) benzene.

Among these, 1,4-bis (1-chlor-1-methylethyl) benzene and 1,3,5-tris (1-chlor-1-methylethyl) benzene are particularly preferable.

In the polymerization, a Lewis acid catalyst may be further added. The Lewis acid may be any one that can be used for the cationic polymerization. Examples of the Lewis acid include TiCl ₄ , TiBr ₄ , BCl ₃ , BF ₃ , BF ₃ .OEt ₂ , Preferably an organic metal halides such as _{Et 2 AlCl, EtAlCl 2; SnCl} 4, SbCl 5, SbF 5, WCl 6, TaCl 5, VCl 5, FeCl 3, ZnBr 2, AlCl 3, AlBr 3 , etc. of metal halides (Et represents ethyl group). Of these, TiCl ₄ , BCl ₃ and SnCl ₄ are preferable in view of their ability as a catalyst and ease of industrial availability.

The amount of the Lewis acid to be used is not particularly limited, but may be set in consideration of the polymerization characteristics or polymerization concentration of the monomers to be used. The compound represented by the general formula (1) is usually used in an amount of preferably 0.1 molar equivalent or more and 100 molar equivalent or less, more preferably 1 molar equivalent or more and 50 molar equivalent or less.

Further, in the above polymerization, the electron donor component may be coexisted as necessary. This electron donor component is believed to have an effect of stabilizing the growth carbon cations at the time of cationic polymerization, and a polymer having a controlled molecular weight distribution can be produced by the addition of an electron donor. The electron donor component that can be used is not particularly limited, and examples thereof include pyridines, amines, amides, sulfoxides, esters, and metal compounds having an oxygen atom bonded to a metal atom.

The polymerization can be carried out in an organic solvent as required, and the organic solvent can be used without particular restriction without essentially interfering with cationic polymerization. Specific examples of the solvent include halogenated hydrocarbons such as methyl chloride, dichloromethane, chloroform, ethyl chloride, dichloroethane, n-propyl chloride, n-butyl chloride and chlorobenzene; aromatic hydrocarbons such as benzene, toluene, xylene, ethylbenzene, Alkylbenzenes, linear aliphatic hydrocarbons such as ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane and the like; alicyclic hydrocarbons such as 2-methylpropane, 2-methylbutane, 2,3,3-trimethylpentane, 2 , And 2,5-trimethylhexane; cyclic aliphatic hydrocarbons such as cyclohexane, methylcyclohexane and ethylcyclohexane; and paraffin oils obtained by hydrogenating and refining petroleum fractions .

These solvents are used alone or in combination of two or more in consideration of the balance of the polymerization characteristics of the monomers constituting the block copolymer and the solubility of the resulting polymer.

The amount of the solvent to be used is preferably 1% by weight or more and 50% by weight or less, more preferably 5% by weight or more and 35% by weight or less, in consideration of the viscosity of the resultant polymer solution and ease of heat removal . ≪ / RTI >

In carrying out the actual polymerization, it is preferable to mix the components at a temperature of, for example, -100 DEG C to 0 DEG C under cooling. In order to balance the energy cost with the stability of the polymerization, a particularly preferable temperature range is -80 ° C or higher and -30 ° C or lower.

Examples of the commercially available elastomer that can be used in the present invention include HYBRAR of Kuraray Co., Ltd. as an elastomer which is a polymer block having a conjugated diene as a main component and a polymer block having an aliphatic hydrocarbon compound as a constituent monomer, And SIBSTAR of Kaneka Co., Ltd. may be mentioned as an elastomer which is a polymer block mainly comprising rhenylene.

The elastomer constituting the impact absorbing pad 10 of the present invention may contain a tackifier resin. The tackifier resin used in the present invention is a low molecular weight resin having a number average molecular weight of 300 to 3000 and a softening point based on a ring method defined in JIS K-2207 of 60 占 폚 to 150 占 폚. By including the tackifier resin in the elastomer, it is easy to increase the shock absorbability in the vicinity of body temperature.

Examples of the tackifier resin in the present invention include rosin and rosin derivatives, polyterpene resins, aromatic modified terpene resins and their hydrides, terpene phenol resins, coumarone-indene resins, aliphatic petroleum resins, alicyclic petroleum resins Aromatic hydrocarbon resins and their hydrides, aliphatic aromatic-based petroleum resins and their hydrides, dicyclopentadiene-based petroleum resins and their hydrides, and low molecular weight polymers of styrene and substituted styrene . Among these, alicyclic petroleum resins and their hydrides, aliphatic petroleum resins, hydrides of aromatic petroleum resins, polyterpene resins, and dicyclopentadiene resins are preferred because of their high compatibility with polymer blocks composed mainly of aliphatic hydrocarbon compounds of an elastomer. Chloropentadiene-based petroleum resin, rosin and the like are particularly preferable.

The blending amount of the tackifier resin is preferably 0 part by weight or more and 100 parts by weight or less, more preferably 10 parts by weight or more and 70 parts by weight or less, based on 100 parts by weight of the elastomer. If the amount exceeds 100 parts by weight, the viscosity at the time of kneading is excessively lowered, so that a sufficient kneading state can not be obtained and it may be difficult to obtain a good foamed article.

In the present invention, a plasticizer may be added to the elastomer as required. The plasticizer is not particularly limited and is not particularly limited, but liquid or liquid materials are preferably used at room temperature. Any hydrophilic or hydrophobic plasticizer may be used. Examples of such a plasticizer include various plastic or resin plasticizers such as mineral oil system, vegetable oil system and synthetic system.

The mineral oils include naphthenic and paraffinic process oils such as castor oil, cottonseed oil, amami oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut oil, And synthetic systems such as polybutene and low molecular weight polybutadiene. Among these, paraffinic process oil or polybutene is preferably used from the viewpoint of compatibility with the elastomer. These plasticizers may be used in appropriate combination of two or more kinds in order to obtain desired viscosity and physical properties.

In the present invention, various additives such as a filler, an antioxidant, a flame retardant, an antibacterial agent, a light stabilizer, a colorant, a flowability improver, a lubricant, an antiblocking agent, an antistatic agent, a crosslinking agent and a crosslinking assistant may be added to the elastomer, Or a combination of two or more. In addition, as long as the performance of the elastomer of the present invention is not impaired, other various thermoplastic resins, thermosetting resins, thermoplastic elastomers and the like may be added.

The impact-absorbing pad of the present invention may be composed of an elastomer foam. For example, a thermoplastic elastomer foam obtained by injection foaming a foamable composition comprising a thermoplastic elastomer and heat-expandable microcapsules can be mentioned. Here, the foamable composition comprises thermally expandable microcapsules. The thermally expandable microcapsule is obtained by microencapsulating a volatile liquid expanding agent with a polymer. Generally, it can be produced by suspension polymerization of at least a polymerizable mixture containing an expanding agent and a polymerizable monomer in an aqueous medium. As the polymerization reaction progresses, a thermally expandable microcapsule having a structure in which an outer shell is formed by a polymer to be formed and encapsulated with an expanding agent is enclosed in the outer shell.

As the polymer forming the outer angle, generally, a thermoplastic resin having good gas barrier properties may be used. The polymer forming the shell is softened by heating. The liquid expanding agent contained in the external resin may be selected to be in a gaseous phase at a temperature lower than the softening point of the polymer.

The use ratio of the heat-expandable microcapsules used in the present invention is not less than 0.5 parts by weight and not more than 10 parts by weight per 100 parts by weight of the foamable composition comprising the elastomer described below and a tackifier resin, plasticizer, More preferably 1 part by weight or more and 5 parts by weight or less. When the use ratio is less than 0.5 parts by weight, it is difficult to obtain an injection-molded foamed article having excellent lightweight properties such that the density of the injection-molded foamed article is less than 700 kg / m 3. On the other hand, And it is difficult to lead to additional low density. In addition, since the thermally expandable microcapsules are in the form of a fine powder, it is often difficult to uniformly blend them, and in view of the risk of dust explosion and the like, they are mixed in a master batch in which they are dispersed at a high concentration in resins that can be processed at relatively low temperatures . In this case, the value obtained by multiplying the compounding amount of the master batch by the content ratio of the thermally expandable microcapsules in the master batch is the compounding amount of the thermally expandable microcapsules.

Next, a method of injection foaming the foamable composition will be described in detail. A known method can be applied to the injection foaming molding method itself, and the molding conditions can be appropriately adjusted according to the fluidity of the foamable composition, the type of molding machine, or the shape of the mold. In the case of the present invention, it is preferable to carry out the molding under conditions such as a resin temperature of 170 to 250 DEG C, a mold temperature of 10 to 100 DEG C, a molding cycle of 1 to 120 minutes, an injection speed of 10 to 300 mm / . There are various methods of foaming in a mold. Among them, a mold having a fixed mold and a movable mold capable of advancing and retracting to an arbitrary position is used, and after the injection is completed, the movable mold is retracted and foamed, The so-called core-bag method (Moving Cavity method) is preferable because an unfoamed layer is formed on the surface, the inner foamed layer tends to become uniform micro-bubbles, and an injection-molded foamed article having excellent lightweight properties is easily obtained.

In the elastomer foam constituting the impact absorbing pad 10, when the expandable microcapsule is used as the blowing agent as described above, the closed cell ratio is characterized by a high rate, whereby it is difficult to sink when the impact is applied, It is difficult to rise, so that it shows excellent impact absorbability. The closed cell ratio of the elastomer foam in the present invention is 80% or more, preferably 90% or more.

The density of the elastomer foam constituting the impact absorbing pad 10 of the present invention is preferably 100 kg / m 3 or more, more preferably 200 kg / m 3 or more. The density may be uniform in the pad body 11 or may be non-uniform. When the density is less than 100 kg / m3, it is necessary to increase the thickness of the pad main body 11 in order to ensure shock absorbability, and the mounting feeling and the discomfort of appearance are deteriorated.

The impact absorbing pad 10 of the present invention is configured such that the garment 20 is attached to the garment main body 21 such that the impact skin 12 is positioned corresponding to the femur electrify portion 1 as shown in Fig. can do. The garment main body 21 to which the shock absorbing pad 10 is attached is not particularly limited. Examples of the garment main body 21 include pants, briefs, shorts, various pants for sports wear and sports, and pants. Especially for the purpose of absorbing the impact of the pants. It can also be attached to diapers and paper pants. The method of mounting the shock absorbing pad 10 is not particularly limited, but a pocket may be formed and sealed in the garment main body 21 so that the position of the shock absorbing pad 10 is not shifted when worn. The impact absorbing pad 10 may be threadedly threaded on the garment main body 21 so as not to be displaced. Further, the impact absorbing pad 10 may be directly contacted to the user's body, or may indirectly contact the user's body via the cloth. In addition, the pockets may be sealed so that the shock absorbing pad 10 can not be taken out, or may be freely taken out or put in. However, in place of the garment main body 21, the cushioning corset having pockets for accommodating the impact absorbing pads 10 is used, and the impact absorbing pads 10 are inserted and held in the pockets, 1, the corset may be fixed to the concave portion so that the impact skin 12 is positioned in correspondence with the position of the impact absorbing pad 10, and in a state in which the impact absorbing pad 10 is inserted and held in the bag using the belt equipped with the bag, The impact absorbing pad 10 may be fixed to the body by a belt so that the impact absorbing skin 12 is positioned in correspondence with the body 1.

In addition, from the standpoint of wearability and the like, if necessary, the impact-absorbing pad 10 of the present invention may be used for the femur electrify portion 1, and another pad may be used where impact is relatively relieved. Other pads include, for example, urethane foams, polyethylene foams, acrylic foams, nonwoven fabrics, and three-dimensional fabrics.

The cloth used for the clothing is not particularly limited, for example, a material, a fibrillation method and the like. For example, in order to improve air permeability and impact absorbability, a cloth having unevenness formed on its surface can be used. A knitting structure in which a shape appears, and file weaving are preferable. Particularly, it has been found that these effects can be exerted by attaching these fabrics to places located on the body side of clothes. Further, a stretch material may be used around the impact absorbing pad 10 in order to effectively relieve the impact by bringing the impact absorbing pad 10 into close contact with the body.

<Impact Absorption Performance Evaluation by Conduction Simulation>

The impact absorption performance of the impact absorbing pad in the present invention was evaluated by computer simulation. Hereinafter, the conduction simulation by the computer will be described.

The left femur model is described in Non-Patent Document 4 (Tanaka Aichi et al., Mechanics of femoral neck fracture by finite element model simulating individual car, Transactions of the Japan Society of Mechanical Engineers, Vol. 70 (697) 1178-85, 2004 ), A model was constructed by adding soft tissue and hip joint to the left proximal femur model produced by the individual femur modeling technique described in detail in the above-mentioned article. This individual femur modeling technique is to construct a simple and rapid modeling of a finite element model that reflects individual differences of the femur shape using 41 shape parameters representing the morphological features of the femur. In the present invention, a model was constructed using mean values and standard deviations of each shape parameter measured for femur specimens extracted from eight women aged 53 to 89 years.

Next, the sectional shape of the femoral soft tissue was approximated to an ellipse, and a membrane element simulating skin was arranged on the side. The femoral head and the osteophyte forming the hip joint were constructed as a concentric hemisphere of the sphere which approximated the head shape according to the shape of the femoral head. The iliac femoral, tibial, and sciatic femoral ligaments, which greatly contribute to the stability of the hip joint, were modeled by membrane elements. The left femur model was constructed by combining the elements modeled by the above method, and the other femur model was constructed by the rigid elements. The center mass of the calculated human body was given a concentrated mass equivalent to the value of each segment mass. The left lower leg was combined with the femur model.

Next, the material characteristics of the left femoral model are described. The femur consisted of isotropic linear elastomers in both the cortical bone and cancellous bone, the Maxwell model in isotropic muscle - fat component in the thigh, and the isosceles linear elastomer in the skin element. Ligamentous element and cartilage of cartilaginous joint. The density of muscle-fat, skin, ligament, and cartilage elements were all 1 g / cm3. The ankle bone element gave the same material properties as the cortical bone. Table 1 shows the material properties used. In the left femoral finite element model created by the above, a concentrated mass is given to the center of each part of the whole body, and a non-patent document 5 (Tanaka Eiichi et al .: biomechanical examination of prevention of femoral neck fracture by a hip protector, (A), 70 (697): 1193-1200, 2004), we used a simplified human body model that reproduces the mass distribution of a human body by connecting each region using a rigid body. A ground model simulating the ground plane was placed in parallel with the femoral finite element model, and the human body model was given a velocity of 2.75 m / s, which is the speed applied at the time of actual conduction in the vertical direction of the wall, Were simulated. The ground model was an isotropic linear elastic body having a cubic shape of 300 mm on one side, and the material constants of the concrete shown in Table 1 were given to give a mass density of 2.3 g / cm 3. The surface of the ground model that does not contact the femur is regarded as a stress - free antireflection boundary, and its displacement is constrained.

For the analysis, a finite element analysis program LS-DYNA (Livermore Software Technology Corp., USA) was used. The shape of the impact absorbing pad was modeled and attached to the femur model, and the compressive principal stress applied to the femoral neck by the conduction simulation was calculated.

The material parameters of the impact-absorbing pad were calculated by introducing the actual material as a material model using a stress-strain curve obtained from the compression test at three different speeds. The material model is represented by LS-DYNA's low-density urethane material model (LOW_DENSITY_FOAM). The size of the impact-absorbing pad differs depending on the embodiment, and is curved to a radius of curvature of 60 mm along the entire thigh.

In the compression test of the actual material, the sample was cut into a circular shape having a diameter of 30 mm at an arbitrary thickness, and subjected to a three-speed condition of 5, 50 and 500 mm / min with a texture-analyzer (manufactured by Eiko Kogyo Co., Ltd.) Stress-strain curves were obtained.

Although a typical elderly woman is different according to the bone density, it is considered that the compressive stress is fractured at about 140 to 260 MPa. In the present invention, 200 MPa is evaluated as a threshold value.

<Density measurement>

The material was cut to a width of 20 mm and the length of each side was measured to calculate the volume, and the density was calculated by dividing the measured weight by volume.

<Evaluation of mounting feeling>

The evaluation of the feeling of mounting was made by putting the impact absorbing pads in the pockets of the pants in which the pockets were formed so that the impact avoiding portions were positioned just above the femoral-bearing supporter 1, and the pants were worn by 10 ordinary panelists for 24 hours, "And" unnaturalness of appearance "when" detachment (including detachment in toilet) "and" unnaturalness of appearance "were carried out. The evaluation criteria are as follows. The average value was calculated from the score of the panelist, and the result was used as an evaluation point.

"Humidity":

◎: I do not feel uncomfortable because I do not feel wet.

○: Almost no sense of discomfort due to little wetness.

△: It can not be said either.

X: It is uncomfortable to feel dampness.

"Discomfort at the time of detachment"

◎: There is no discomfort at the time of attaching / detaching.

○: There is almost no inconvenience when attaching / detaching.

△: It can not be said either.

X: There is a sense of incongruity due to a hook at the time of detachment.

"Exterior":

○: It is hardly known that the shock absorbing pad is seen from the outer surface of the garment.

△: It can not be said either.

X: It can be seen from the outer side of the garment that the shock absorbing pad is contained.

(Example 1)

As Example 1, it was made of NP gel (foam gel) (manufactured by Tai Ka Co., Ltd.) and had a rectangular shape with a length of 140 mm and a width of 120 mm like the impact absorbing pad 10A shown in Fig. An impact absorbing pad having a shock absorbing skin 12 formed of through holes having a diameter of 12 mm and a diameter of 50 mm was manufactured.

(Example 2)

As Example 2, an impact absorbing pad having the same structure as that of the impact absorbing pad of Example 1 except that the thickness was 8 mm was manufactured.

(Example 3)

The impact-absorbing pads of Examples 3 to 5 were evaluated using the following elastomer foams.

A mixture of 100 parts by weight of an elastomer having a polystyrene block-polyisobutylene block-polystyrene block, SIBSTAR072T (manufactured by Kaneka Corporation) and 18 parts by weight of a hydrogenated petroleum resin, ARCON P140 (manufactured by Arakawa Chemical Industries Co., Ltd.) 10 parts by weight of a fine microcapsule master batch and fine cell master MS405K (trade name, a thermally expandable microcapsule content of 40 wt%, manufactured by Dainichi Seisakusho Co., Ltd.) was blended with 4 parts by weight of a thermally expandable capsule to prepare a foamable composition. This was melt-kneaded in an injection molding machine of "MD350S-IIIDP type" (manufactured by Ube Rubber Industries, Ltd.) (shutoff nozzle specification) at a resin temperature of 200 ° C and a back pressure of 15 MPa and then a pin gate having a diameter of 2 mm , A box-shaped cavity (mouth portion: 10 degrees of inclination, 3 mm of clearance, bottom surface: clearance t0 = 3.0 mm) of 330 mm in length × 230 mm in width × 100 mm in height constituted by a fixed type and a movable type movable forward and backward. Was injection-molded at an injection speed of 100 mm / sec. After completion of the injection filling, the movable mold was retracted so that the clearance on the bottom surface was 6.5 mm, and the resin in the cavity was foamed. After completion of the foaming, the foams were cooled for 60 seconds, and then the elastomer foam was taken out. The bottom of the box was cut and a compression test was conducted.

As Example 3, like the impact absorbing pad 10A shown in Fig. 3 (a), it is made of the above elastomer foam and has a rectangular shape with a length of 140 mm and a width of 120 mm, a thickness of 12 mm, An impact absorbing pad was formed which had the impact skin 12 formed of through holes having a diameter of 50 mm.

(Example 4)

As Example 4, in the same manner as in the impact absorbing pad 10B shown in Fig. 3 (b), which is made of the elastomer foam, is placed at a position of 22 mm from the lower end of the impact absorbing pad 12 of the impact absorbing pad of Example 3 An impact absorbing pad was produced in which the first relieved portion 13B having a top end and a rectangular perforation hole having a length of 6 mm and a width of 75 mm was formed.

(Example 5)

As Example 5, in the same manner as in the impact absorbing pad 10C shown in Fig. 3 (c), which is made of the elastomer foam, is placed at a position of 6 mm from the lower end of the impact absorbing pad 12 of the impact absorbing pad of Example 3 A first relieved portion 13C made of a through hole having a length of 6 mm and a width of 18 mm and having an upper end and a top end at a position of 6 mm from the lower end of the first relieved portion 13C, An impact absorbing pad in which the relieving portion 13C was formed was manufactured.

(Example 6)

In Example 6, an elastomer foam prepared in the same manner as in Example 3 was used except that the elastomer having a polystyrene block-polyisobutylene block-polystyrene block of Example 3 was changed to SIBSTAR062T (manufactured by Kaneka Corporation) . The shape of the impact-absorbing pad of Example 6 is an ellipse having a long side of 170 mm and a short side of 130 mm as in the case of the impact absorbing pad 10 shown in Fig. 3 (d), and has a thickness of 8 mm. In addition, the impact-resistant skin 12 made of the through hole having the diameter of 50 mm and having the upper end at a position of 40 mm from the upper end of the impact absorbing pad 10 was formed. A first abatement portion 13 made of a through hole having a diameter of 20 mm and having an upper end at a position of 15 mm from the lower end of the impact skin 12 is formed and an upper end is provided at a position of 10 mm from the lower end thereof A first abatement portion 13 composed of a through hole having a diameter of 20 mm was formed. A second relieved portion 14 formed of a through hole having a diameter of 30 mm and having a left end at a position of 14 mm from the right end passing through the center line in the transverse direction of the first relieved portion 13 is formed, A second relieved portion 14 having a right end at a position of 14 mm from the left end of the one relief portion 13 and having a through hole with a diameter of 30 mm was formed.

(Example 7)

As Example 7, an impact-absorbing pad having the same constitution as that of the impact-absorbing pad of Example 6 except that the thickness was 5 mm was produced.

(Example 8)

In Example 8, 10 parts by weight of a heat-expandable microcapsule master batch and fine cell master MS405K (thermal expansion microcapsule content 40 wt%, manufactured by Dainichi Pharmaceutical Co., Ltd.) were added to 100 parts by weight of an elastomer and SIBSTAR072T (manufactured by Kaneka Corporation) (4 parts by weight of thermo-expansive capsules) to obtain a foamable composition, and an elastomer foam obtained in the same manner as in Example 3 was used. The shape of the impact absorbing pad of Example 8 is rectangular with a length of 140 mm and a width of 120 mm like the impact absorbing pad 10A shown in Fig. 3 (a), and has a thickness of 8 mm, And an impact-resistant skin 12 made of a hole was formed.

(Example 9)

In Example 9, an elastomer, SIBSTAR072T (manufactured by Kaneka Corporation) was used as a material, and this was subjected to press molding at 200 占 폚 to obtain a plate having a thickness of 8 mm. As shown in Fig. 3 (a), a rectangular shape having a length of 140 mm and a width of 120 mm is cut from the plate to form an impact skin 12 made of a through hole having a diameter of 50 mm, An impact absorbing pad was produced.

(Comparative Example 1)

And the compressive stress applied to the femoral neck portion 2 when the impact absorbing pad is not used is calculated.

(Comparative Example 2)

As a comparative example 2, a pad used in a hip protector (manufactured by Gunze Co., Ltd.) was taken out, and in the same manner as the actual pad size, like the impact absorbing pad 30A shown in Fig. 4A, A shock absorbing pad having a rectangular shape of 12 mm and without a hole was produced.

(Comparative Example 3)

As Comparative Example 3, an impact absorbing pad was constructed in the same manner as in Comparative Example 2 except that the thickness was 5 mm.

(Comparative Example 4)

As in Comparative Example 4, the same material as that of the impact-absorbing pad of Example 4 was used, and like the impact-absorbing pad 30B shown in Fig. 4 (b) Mm, a thickness of 12 mm, and an impact absorbing pad without the impact skin 12 was produced.

(Comparative Example 5)

As Comparative Example 5, except that the impact skin 31C having a diameter of 20 mm was formed in place of the impact skin 12 like the impact absorbing pad 30C shown in Fig. 4 (c) An impact absorbing pad having the same structure as that of the absorbing pad was produced.

(Comparative Example 6)

As Comparative Example 6, the impact-absorbing pad used in the cushion pants (manufactured by Tokyo Angel Co., Ltd.) was evaluated. The shape of the impact absorbing pad of Comparative Example 6 was an ellipse having a length of 160 mm, a width of 120 mm and a thickness of 20 mm like the impact absorbing pad 30D shown in Fig. 4 (d).

(Comparative Example 7)

As Comparative Example 7, an impact absorbing pad having the same structure as that of the impact absorbing pad of Example 6 except that the thickness was 14 mm was manufactured.

(Comparative Example 8)

As Comparative Example 8, an impact absorbing pad having the same structure as that of the impact absorbing pad of Example 6 except that the thickness was 12 mm and the impact skin 12 was set to 90 mm in diameter was produced.

Examples 1 to 9 and Comparative Examples 1 to 8 were subjected to the evaluation tests described above, and the results shown in Table 2 were obtained.

From Table 2, it can be seen that the maximum compressive principal stress by simulation is higher than that of Examples 1 to 8 when no impact skin is formed as in Comparative Examples 1 to 4. When the impact skin is formed as in Comparative Example 5 , It is understood that the maximum compression principal stress becomes large and the impact force against the femoral head electromagnet can not be sufficiently absorbed.

In Examples 1 to 8, on the other hand, in Examples 1 to 3, 8 and 9 in which the first relieved portion and the second relieved portion formed of through holes were not formed, wetness easily occurred, and the density It is preferable to form the first relieved portion and the second relieved portion which are made of the through holes as in Examples 4 to 7 in that the feeling of discomfort at the time of mounting occurs unless the thickness is set to be low. In addition, in consideration of the appearance at the time of use, it is preferable to set the thickness to 8 mm or less as in the sixth and seventh embodiments.

1 Femur Conjugate 2 Femoral neck
3 Femoral shaft
10 shock absorbing pad 11 pad body
12 Impact skin 13 1st relief
14 Second Reduction Department
20 Apparel 21 Apparel Body
10A shock absorbing pad
10B shock absorbing pad 13B first abatement part
10C shock absorbing pad 13C first abatement part
30A shock absorbing pad 30B shock absorbing pad
30C Shock absorption pad 31C Impact skin
30D shock absorbing pad

Claims (13)

A shock absorbing skin comprising a through hole or a concave portion having a maximum length of not more than 80 mm and an area of not less than 600 mm 2 and not more than 5,000 mm 2 is formed on the pad body having an impact absorbing function, Wherein the pad body is disposed so as to prevent fracture of the femur,
Wherein a thickness of the pad body is set to 13 mm or less and a through hole or concave portion having an upper end at a position of 5 mm or more and 50 mm or less from the lower end of the impactor skin below the impact skin of the pad body, And a length of a maximum portion of the first relieved portion is set to 5 mm or more and 50 mm or less. delete The method according to claim 1,
Wherein a distance from an upper end of the impact skin to an upper end of the pad body is set to 10 mm or more. delete delete The method according to claim 1 or 3,
And a second relieved portion formed of at least one through hole or concave portion at not more than 50% of the total area of the impacted skin and the entire area other than the first relieved portion in the pad body. The method according to claim 1 or 3,
Wherein the pad body is made of an elastomer, which is an isobutylene block copolymer composed of a polymer block having isobutylene as a constituent monomer and a polymer block having an aromatic vinyl monomer as a constituent monomer. 8. The method of claim 7,
Wherein the elastomer contains a tackifying resin. The method according to claim 1 or 3,
Wherein the pad body is made of an elastomer foam. The garment according to any one of claims 1 to 3, wherein the impact absorbing pad is mounted on the garment main body such that the impact preventing portion of the impact absorbing pad according to any one of claims 1 to 3 is disposed corresponding to the femur supporter. 11. The method of claim 10,
Wherein the impact absorbing pad is detachably attached to the garment main body. 11. The method of claim 10,
Wherein the garment body is pants. delete

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